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Unformatted text preview: T wave (ventricular repolarization) This is the traeing caused by ventricular repolarization. Lasts 0.16 sec. Ventricular relaxation follows. Heart Yalves During the cycle, the valves open and close in response to differences in BP on their two sides. Pulmonary semilunar valve - at the entrance to the pulmonary trunk. Prevents backflow into the right ventricle. Right AY valve (tricuspid) - prevents backflow into right atrium when right ventricle contracts. Has three valve flaps. Aortic semilunar valve - at entrance to aorta. Prevents backflow into left ventricle. Left Av valve (bicuspidimitral) - prevents backflow into left atrium when left ventricle contracts. Has two valve flaps. YD...
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- Spring '11